Ha! My friend Rick would disagree with you on that. Sort of a long story, but...
Rick's a Vietnam vet, and former Albuquerque Police Department officer. He's also a firearms instructor and 6th or 7th degree black belt in whatever discipline of karate he adheres to. And a lifelong motorcycle enthusiast. We were good friends back in the late 1980s. Among other things, he was a commercial hot air balloon pilot, and I was his Crew Chief. He was well-adjusted and everything was going great until about 20 years ago, when he was hit by lightning. It messed him up something fierce. I'd moved away and lost contact with him during those years, but by his account, he was a drooling mess who had trouble with life's basic necessities - including walking - for several years. Once he got rehabbed and able to take care of himself, he started having PTSD issues for the first time in his life. All of the stuff from Vietnam that had been bottled up came out. The problems would manifest themselves in the form of panic attacks. Eventually, he discovered that his dog Riley could sense the onset of an attack before it'd happen, and somehow warn him so he could take preventative measures. He took the dog with him everywhere, but was bummed that he could no longer ride his Harley, because the dog couldn't come along. Then a friend suggested a sidecar, and the rest, as they say, is history. Riley has since passed on, but not before teaching two other dogs how to sense the attacks. And with therapy and drugs, Rick has also gotten the PTSD under much better control, so he no longer feels the need to always have the dogs with him. Still, the dogs love riding in the sidecar, so he still takes them cruising when he can.
So for Rick, the Harley and sidecar is actually the best of both worlds.